Question

In Visual C#, how can I detect if the user clicks the X button to close the program? I want to ask the user if they’d like to perform a certain action before exiting. I have an exit button in my program itself, and I know I can code it as follows:

    private void exitToolStripMenuItem_Click(object sender, EventArgs e)
    {
        DialogResult result;
        if (logfiletextbox.Text != "")
        {
            result = MessageBox.Show("Would you like to save the current logfile?", "Save?", MessageBoxButtons.YesNo, MessageBoxIcon.Asterisk);
            if (result == DialogResult.Yes)
            {
                savelog.PerformClick();
            }
        }
        Environment.Exit(0); //exit program
    }

But how can I do this for the X button that is already built into the program?

Answer 1

    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (MessageBox.Show("cancel?", "a good question", MessageBoxButtons.YesNo) == DialogResult.Yes)
        {
            e.Cancel = true;
        }
    }

It’s the “FormClosing” – event of the form. Have fun, friend.